Stone-sawing machine.



PATENTED JUNE 2, 1903.

- G. A. THOMSON. STONE SAWING MACHINE.

APPLICATION FILED AUG. 26, 1901;

N0 MODEL.

INVENTOR WITNESSES.

PATENTED JUNE 2, 1903;

0. A. THOMSON. STONE SAWING MACHINE.

APPLICATION FILED AUG. 26, 1901.

I a SHEETS-SHEET "2.

no MODEL INVENTOR 4 J ATTORNEYS No; 729,975. S 3 PATENTED JUNEZ. 1903.

0. A. THOMSON.

STONE SAWING MACHINE.

APPLIGATION FILED AUG. 26, 1901. N0 MODEL. 3 SHEETS-SHEET 3.

WITNESSES:

I I I r ATTORNEYS w: wraa's warzns cofr-ncnqumu, WASHINGTON, u. c

UNITED STATES Patented June 2, 1903.

PATENT OFFIGE.

STONE-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 729,975, datedJ'une 2, 1903. Application filed August 26, 1901. Serial No. 79,248. (No model) To all whom, it may concern:

following to be a full; clear, and exact description of the inventiomsuch as will enable others skilled in the art towhich it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

This invention relates to machines for sawing-blocks of stone; as is commonly done in stone-yards; and the objects of the invention are to impart to thesaw movement in a hori- Zontal line or line parallel to the surface of the work, to secure such a movement by simple mechanism and such as will not readily get out of order, to place the working parts where the shot or crushed steel cannot enter them during the operation of the machine, to enable a saw without teeth to be used, and to secure other advantages and results, some of which may be hereinafter referred to in connection with the description of the working parts.

The invention consists in the improved stone-sawing machine'herein described and in the arrangements and combinations of.

parts of the same, all substantially as will be hereinafter set forth and finally embraced in the clauses of the claim.

Referring to the accompanying drawings, in which like letters of reference indicate corresponding parts in each of the several figures, Figure 1 is an-end View of my improved machine; and Fig. 2 is a vertical central section of the same on line to, Fig. 1. Fig. 3 is a do tail view of the sliding fulcrum of a certain swinging arm; and Figs. 4 and 5 illustrate, respectively, the outer and inner members of said sliding fulcrum; Figs. 6 and 7 show in side and edge view, respectively, a construction which permits a toothless saw to be used.

In said drawings,a a indicate rigid uprights adapted totsupport the working parts of my sawing-machine, said uprights being arranged two on each side of a track I), on which runs a stone-carriage d, carrying the stone 0 to be sawed. Between said uprights a and above the stone-carriage track I) in horizontal position is suspended asaw-frame e of usual construction, adapted tobe reciproeated in the direction of thetrackby means I of a suitable pitman or connecting rod f. Saws 9 of any desired number extend longitudinally from said frame, being secured at their opposite ends by the usual tighteningbolts h, passing through slots 2' in the end beams and having nuts h screwing upon their outer ends. relates to the means next to be described for supportin g the said saw-frame and saws while 'they'are reciprocated, so that said frame will befreeto swingand at the same time will never depart from a fixed plane. To this end arms 3' extend upwardfrom the side pieces of the frame 6, being pivoted thereto at their lower extremities and extending upward one near each upright dot the machine. The upper end of each armj is pivoted in the preferred construction to the upper end of a secondor auxiliary arm is, which is preferably much shorter than the arm j, but lies in the same general position with its lower end pivoted at a relatively fixed point I. Intermediate of its upper and lower ends each main arm j is fulcrumally held in a clasp m, which permits said arm to slide longitudinally therein and is also itself pivotedto rotate in the plane of the swinging arm. The arms 7*, of which there are usually four for gang-saws and two for rip-saws, are preferably always parallel to one another, and in operation as the sawframe is moved, say, from the position shown in full lines in Fig. 2 to that shown by the dotted lines, each arm j acts as a lever, ful- My invention particularly.

erumed at m, and forces the upper pivotallybe seen that the upper end of the arm j is thus raised at such times as its lower end would be lowered by the swinging and lowered as the said lower end would be raised, and a compensating action is secured whereby the lower ends of the swinging arms on travel in straight lines and the saw-frame moves horizontally. The fulcrumal slideway m is pref erably formed of a plane block or member a on the outside of the arm and having a stem or shaft 02', upon which rotation takes place. A second member 0, grooved, as at 0', to loosely receive the arm j, is then bolted against the inner side ofsaid first-mentioned member, and for greater rigidity a rod 0 extends across above the saw-frame to the corresponding member of its opposite fulcrumal slideway m.

. In order to enable a toothless saw to be used and the shot or crushed steel still fed beneath its cutting edge, I may sometimes employ the construction shown in Figs. 6 and 7, where the upper end of the swinging arm j is provided with a friction-roller 1), adapted to run in a path or slot q. Said slot (1 is primarily curved, as on the arc of a circle, to secure the compensating effect just described, and

then this curved path is made wavy or undu-' lating, so as to alternately raise the saw from its horizontal plane and then drop it back again. This enables the shot to work downward at the sides of the saw-blade and get beneath its cutting edge. Obviously the slot (1 may be made on a regular curve or are of a circle, if desired, and the construction used with toothed saws to secure simply horizontal motion of the sa\v-frame.

The saw-frame must of course be adjustable up and down to engage the stone,and to this end the fulcrumal slideway m and lower end of the auxiliary arm is are both pivoted on a rigid slide 0, or in case of theslotq said slot is out in an extension of the slide 1'. Said slide moves vertically upon suitable slideway s on the side of the uprights a, and all of the slides are controlled by screwshafts 15, passing through threaded perforations in the slides and being operated from above, either simultaneously or otherwise, by suitable means. (Not shown.)

It will thus be seen that by my invention I secure a perfectly horizontal movement of the saw-frame and saws, so that a long stroke parallel to the surface to be out is obtained, and, furthermore, the saws may be given a limited alternate up-and-down motion as they move horizontally to facilitate the entrance of shot beneath the blades. The means by which I accomplish this are, moreover, Very simple and are located above the saw-frame, where escaping shot or crushed steel cannot get into the working parts and injure them.

Having thus described the invention, what I claim as new is- 1. The herein-described means for imparting to a saw-frame motion in a straight line, comprising a lever pivoted at one end to said saw-frame, a fulcrum slidably engaging said lever intermediate of its ends, and an auxiliary lever lying in the same general position as the main lever and having its outer end pivoted to the outer end of said main lever while its inner end is pivoted at a fixed point.

2. The herein-described means for supporting a reciprocatory member so that it moves in a straight 1ine, said means comprising opposite arms j, from the lower ends of which the reciprocatory member may be pivotally hung, shorter arms 7c, pivoted at their lower ends below the upper ends of the first-mentioned arms and being hinged at their upper ends to the said upper ends of the main arms, and connected pivotal clasps m, through which the main arms pass.

3. In a sawing-machine or the like, armsj, adapted to pivotally support the saw at their lower ends, vertically-adj ustable slides r, fulcrumal clasps m, pivoted on said slides and slidably holding the arms, and auxiliary arms 7c, pivoted at one end on said slides and hinged at the other end to the upper ends of said main arms.

In testimony that I claim the foregoing I have hereunto set my hand this 22d day of August, 1901.

CHARLES A. THOMSON.

Witnesses:

HENRY KRUG, RUSSELL M. EVERETT. 

